. >>> president obama and the first lady will travel to south africa to attend a memorial for nelson mandela on tuesday. as tina krause reports, huge crowds are paying tribute round the clock to the man who changed the destiny of that nation. >> reporter: south africans celebrated nelson mandela's life into the night. paying tribute to their country's first black president. ♪ earlier in the day, mandela's grandchildren met with well wishers who shared flowers and memories of the man they call the father of their nation. he is -- >> as far as i'm concerned will always be the greatest man that -- ever lived. and i love him and may he rest in peace. >> reporter: paying their respects and the crowds will only get bigger throughout the week as the official memorial begins. children in man deal dell la's former home danced to celebrate his life. on tuesday, the township will host a memorial service at a soccer stadium where up to 100,000 people are expected. world leaders are headed to south africa to honor the antiapartheid leaders who spent 27 years in prison. he was a fellow inmate at